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摘要本毕业毕业设计是关于中大跨度预应力混凝土连续梁桥上部结构的设计。预应力混凝土连续梁桥具有以下优点：结构受力性能好、变形小、伸缩缝少、养护工程量小、抗震能力强。
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本毕业设计的连续梁桥为昆山市赵家桥，桥梁跨度为四跨，跨径布置为：30m+30m+30m+30m，为分离式设计，半幅桥面宽19.2m，分离式双向八车道，设有2m宽的人行道。主梁施工采用分段支架施工，对称平衡浇筑混凝土。35155
本毕业设计旨在运用大型有限元软件 Midas 设计一座4×30m的先简支后连续的预应力混凝土连续梁桥。首先根据国家现行规范和目前同类结构设计中的做法进行了混凝土收缩徐变函数定义及上部结构截面选择。其次，通过建立有限元模型对恒载、活载内力进行了计算并进行了荷载组合。再次，根据结构在承载能力极限状态和正常使用极限状态的内力估算并布置预应力钢束，并验算了各项应力。最后对横隔板、行车道板及下部结构进行了设计。
毕业论文关键词: 预应力混凝土、连续梁、T梁
Abstract
This graduation design is about the design of the upper structure of middle span PC continuous girder bridge. The pre-stressed concrete continuous girder bridge has the following advantages: the structure is good, the deformation is small, the expansion joint is little, the maintenance engineering is small, and the earthquake resistance is strong.
The graduation design of continuous beam bridge Zhao Jia Qiao, Kunshan City, span bridge spans, span arrangement: 30m+30m+30m+30m. For the separation of design, the half width of the deck width of 19.2m and separation type two-way eight lane, a 2m wide sidewalks. Construction of the main girder using segmental bracket construction, symmetrical balance pouring concrete.
This graduation design is to use large-scale finite element software MIDAS design of a 4 * 30m to Jane supported continuous prestressed concrete continuous beam bridge. Firstly, the definition of shrinkage and creep function of concrete and the selection of superstructure section are carried out according to the current codes of the state and the current practice of the similar structure design.. Secondly, by establishing the finite element model, the internal force of dead load and live load are calculated and load combination is carried out.. Thirdly, according to the internal force of the structure in the load bearing capacity limit state and normal use limit state, the prestressed steel bundle is calculated and the stress is checked.. At the end of the diaphragm, and the lower deck structure design.
Keywords: prestressed concrete continuous beam T beam
目录
1绪论 6
1.1预应力混凝土连续梁桥概述 6
1.2 毕业设计的目的与意义 6
2设计资料 8
2.1桥梁概况 8
2.2 设计参数 8
2.3 工程地质 8
2.4场地水文地质条件 9
2.5工程设计参数 10
2.6规范标准 10
3 桥梁结构的总体布置及结构尺寸拟定 11
3.1本桥主要材料 11
3.1.1混凝土 11
3.1.2预应力钢绞线 11
3.1.3普通钢筋 12
3.2结构尺寸图 12
3.2.1横截面 13
3.2.2T梁截面 14
3.3毛截面的几何特性 16
4 荷载计算 17
4.1主梁分段与施工方法 17
4.1.1分段原则 17
4.1.2具体分段 17
4.2计算模型 17